Under the iTunes in the Cloud section, click Manage Devices. (If you haven't associated any devices with your Apple ID, you won't see the Manage Devices section.) Information about each associated device appears. Next to each device, you can see when it associated with your Apple ID.
The real reason why the burp smells so badly is hydrogen sulfide (H2S). If you eat foods that have sulfur proteins in them then you may find yourself burping the H2S, which will smell like rotten eggs. The sulfur reducing microbes in the intestine digest the proteins and release the gas.
Gas pains in strange places. Have had this problem for as long as can remember. Get pains (mostly arms/legs) which are relieved when I burp (burpspots). Massaging area will bring on burp(s) and eventual relief of pain. Sometimes feels like I'm having a heart attack. Experienced bad pain in upper left arm, neck and shoulder over last 48 hours with much burping. Pain moves around and is somewhat relieved after each burp. Paid can be quite excruciating for a short period of time, until burps relieve it.